They are really useful for checking or modifying cookies [HTTP::cookie], the host domain [HTTP::host], path [HTTP::path] and query parameters [HTTP::query] of URLs and requests.
A sligth word of warning though.... any checks made on the QUERY of a HTTP request actually search the URI of the referer as well. As an example, the following iRule would send a HTTP 200 response if you were either requesting a URL with a query parameter of "ThereIsAQuery" OR if you're refer page's URL included a query parameter of "ThereIsAQuery".
when HTTP_REQUEST {
if {
([HTTP::QUERY] eq "ThereIsAQuery")
}
{
HTTP::respond 200 content "<html><body>There is a Query</body></html>"
}
}
Other attributes such as [HTTP::host], [HTTP::path], and [HTTP::uri] are only valid for the requested URL. They are not checked in the referer header.
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You live and learn :)
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